Again, please explain the issue here. What I can see from your survey structure, group 4 is only mandatory if question G3Q00001 is answered yes. In the picture you attached, he/she answered "no", meaning questions 4.1 would never be shown.

The problem is that there are different questions and according to the answer (yes / no) the person does the survey, then some questions are not necessarily answered and when I export the survey in the option "Completed responses only" should print only the questions that they were answered.

Ah! Sorry, this is a misunderstanding of what it means to be "complete". A response is complete if the user *finished the survey*. If the survey is aborted in the middle, the response is marked as incomplete.